Good analysis, I did a back of envelope calculation.
If we assume:
the average height of mineralisation: 300m
the average width: 300m
the length: 650m
The density of the corbonitite: 2.7
We get 300*300*650*2.7= around 158 million tonnes of ore at around 2.5%. Double the height, we have 315 million tonnes.
The breccia zone has half the grade (may be less), but it seems like it will add around 50% more to the tonnage.
